BIO 1130 Lecture Notes - Lecture 17: Symmetry In Biology, Gastrulation, Flatworm

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Cells on top (up down left right) radical cleavage. Cells on bottom (top right top left bottm right bottm left) spiral cleavage. Blastopore goes in for first opening cells separate and get a second opening of ectoderm and endoderm giving a gut. Blastopore becomes a mouth or a anus. Schizocoel from bottom to top to form a cavity form by a split and putting in the mesoderm in there. Entercoel gut from swelling of blebs. Acoelomate solid body no cavity solid mass of mesoderm flat worm. Pseudocaoelmoate semi body cavity lining on the ectoderm nematodes (for miniaturizing) Coelomate body cavity has a gut mesoderm lining worm. Lophophore (tentacles surrounding a mouth trap food and feed) or trochophore (locomotion gives food into the organism) Collagenous cuticle without microvilli longitudinal but no circular muscle. Nematode gut always collapsed, devloped a unique pharynx of having a bulb (valve system ) Triradiated pharynx, sperm has no flagellum and one testi.